Webhooks

EAS can alert you as soon as your build or submission has completed via a webhook. Webhooks need to be configured per-project, so if you want to be alerted for both @johndoe/awesomeApp and @johndoe/coolApp, you need to run eas webhook:create in each directory.

Are you using the classic build system? (expo build:[android|ios])

Webhooks function almost exactly the same for both EAS Build and the classic expo build system, except that for expo build webhooks, you'll use expo-cli to interact with them, and not eas-cli. For expo build webhooks, you'll use:

expo webhooks [path]: List all webhooks for a project
expo webhooks:add [path]: Add a webhook to a project
expo webhooks:remove [path]: Delete a webhook
expo webhooks:update [path]: Update an existing webhook

After running eas webhook:create, you'll be prompted to choose the webhook event type (unless you provide the --event BUILD|SUBMIT parameter). Next, provide the webhook URL (or specify it with the --url flag) that handles HTTP POST requests. Additionally, you'll have to input a webhook signing secret, if you have not already provided it with the --secret flag. It must be at least 16 characters long, and it will be used to calculate the signature of the request body which we send as the value of the expo-signature HTTP header. You can use the signature to verify a webhook request is genuine (example code below).

EAS calls your webhook using an HTTP POST request. All the data is passed in the request body. EAS sends the data as a JSON object.

Additionally, we send an expo-signature HTTP header with the hash signature of the payload. You can use this signature to verify the authenticity of the request. The signature is a hex-encoded HMAC-SHA1 digest of the request body, using your webhook secret as the HMAC key.

If you want to test the above webhook locally, you have to use a service like ngrok to forward localhost:8080 via a tunnel and make it publicly accessible with the URL ngrok gives you.

You can always change your webhook URL and/or webhook secret using eas webhook:update --id WEBHOOK_ID. You can find the webhook ID by running eas webhook:list. If you would like us to stop sending requests to your webhook, run eas webhook:delete and choose the webhook from the list.

Webhook payload

Build webhook payload

The build webhook payload looks something like this:

{
  "id": "147a3212-49fd-446f-b4e3-a6519acf264a",
  "appId": "bc0a82de-65a5-4497-ad86-54ff1f53edf7",
  "initiatingUserId": "d1041496-1a59-423a-8caf-479bb978203a",
  "cancelingUserId": null, // available for canceled builds
  "platform": "android", // or "ios"
  "status": "errored", // or: "finished", "canceled"
  "artifacts": {
    "buildUrl": "https://expo.dev/artifacts/eas/wyodu9tua2ZuKKiaJ1Nbkn.aab", // available for successful builds
    "logsS3KeyPrefix": "production/f9609423-5072-4ea2-a0a5-c345eedf2c2a"
  },
  "metadata": {
    "appName": "example",
    "username": "dsokal",
    "workflow": "managed",
    "appVersion": "1.0.2",
    "cliVersion": "0.37.0",
    "sdkVersion": "41.0.0",
    "buildProfile": "production",
    "distribution": "store",
    "appIdentifier": "com.expo.example",
    "gitCommitHash": "564b61ebdd403d28b5dc616a12ce160b91585b5b",
    "releaseChannel": "default",
    "appBuildVersion": "6",
    "trackingContext": {
      "platform": "android",
      "account_id": "7c34cbf1-efd4-4964-84a1-c13ed297aaf9",
      "dev_client": false,
      "project_id": "bc0a82de-65a5-4497-ad86-54ff1f53edf7",
      "tracking_id": "a3fdefa7-d129-42f2-9432-912050ab0f10",
      "project_type": "managed",
      "dev_client_version": "0.6.2"
    },
    "credentialsSource": "remote",
    "isGitWorkingTreeDirty": false
  },
  "metrics": {
    "memory": 895070208,
    "buildEndTimestamp": 1637747861168,
    "totalDiskReadBytes": 692224,
    "buildStartTimestamp": 1637747834445,
    "totalDiskWriteBytes": 14409728,
    "cpuActiveMilliseconds": 12117.540078,
    "buildEnqueuedTimestamp": 1637747792476,
    "totalNetworkEgressBytes": 355352,
    "totalNetworkIngressBytes": 78781667
  },
  // available for failed builds
  "error": {
    "message": "Unknown error. Please see logs.",
    "errorCode": "UNKNOWN_ERROR"
  },
  "createdAt": "2021-11-24T09:53:01.155Z",
  "updatedAt": "2021-11-24T09:57:42.715Z",
  "expirationDate": "2021-12-24T09:53:01.155Z"
}

Submit webhook payload

The submit webhook payload looks something like this:

{
  "id": "0374430d-7776-44ad-be7d-8513629adc54",
  "appId": "23c0e405-d282-4399-b280-5689c3e1ea85",
  "initiatingUserId": "7bee4c21-3eaa-4011-a0fd-3678b6537f47",
  "turtleBuildId": "8c84111e-6d39-449c-9895-071d85fd3e61", // available when submitting a build from EAS
  "platform": "android", // or "ios"
  "status": "errored", // or: "finished", "canceled"
  "submissionInfo": {
    // available for failed submissions
    "error": {
      "message": "Android version code needs to be updated",
      "errorCode": "SUBMISSION_SERVICE_ANDROID_OLD_VERSION_CODE_ERROR"
    },
    "logsUrl": "https://submission-service-logs.s3-us-west-1.amazonaws.com/production/submission_728aa20b-f7a9-4da7-9b64-39911d427b19.txt"
  },
  "createdAt": "2021-11-24T10:15:32.822Z",
  "updatedAt": "2021-11-24T10:15:32.822Z"
}

Webhook server

Here's an example of how you can implement your server:

const crypto = require('crypto');
const express = require('express');
const bodyParser = require('body-parser');
const safeCompare = require('safe-compare');

const app = express();
app.use(bodyParser.text({ type: '*/*' }));
app.post('/webhook', (req, res) => {
  const expoSignature = req.headers['expo-signature'];
  // process.env.SECRET_WEBHOOK_KEY has to match SECRET value set with `eas webhook:create` command
  const hmac = crypto.createHmac('sha1', process.env.SECRET_WEBHOOK_KEY);
  hmac.update(req.body);
  const hash = `sha1=${hmac.digest('hex')}`;
  if (!safeCompare(expoSignature, hash)) {
    res.status(500).send("Signatures didn't match!");
  } else {
    // do something here, like send a notification to Slack!
    // console.log(req.body);
    res.send('OK!');
  }
});
app.listen(8080, () => console.log('Listening on port 8080'));